Technics SLP 990 Service Manual

Page 2

SL-P990

I CONTENTS

Page
SAFETY PRECAUTIONS ......... SCHEMATIC DIAGRAM ............................... 28~34
PRECAUTION OF LASER DIODE . PRINTED CIRCUIT BOARD AND
BEFORE USING THIS UNIT ...... CONNECTION DIAGRAM ........................... 35~38
FRONT PANEL CONTROLS AND FUNCTIONS REPLACEMENT PARTS LIST (ElecIrIc parts) . . . . .39~4D
REMOTE CONTROL TRANSMITTER . EXPLODED VIEWS ............................ .41~43

CONNECTIONS . REPLACEMENT PARTS LIST (Mechanicd parts) . . 44
OPERATION . . . . REMOTE CONTROL UNIT PARTS .. . 45
CONVENIENT FUNCTIONS .. PACKING .. 46
RECORDING FROM COMPAC . RESISTORS A .47~49
HANDLING PRECAUTIONS FOR OPTICAL PICKUP . BLOCK DIAGRAM ............. . . .50~52
DISASSEMBLV INSTRUCTIONS .......... TERMINAL FUNCTION OF LSI . .53~57
MEASUREMENTS AND ADJUSTMENTS . INTERNAL CONNECTION OF FL ......................... 58

SCHEMATIC DIAGRAM OF REMOTE CONTROL UNIT ---- 27

- SAFETY PRECAUTIONS (This safety precaution is applied only in U.S.A.)

(Ila>(;)N.d

. Before servicing, unplug the power cord to prevent an electric shock.

, When replacing parts, use only manufacturer's recommended components for safety.

. Check the condition of the power cord. Replace if wear or damage is evident.

. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.

, Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to

prevent the customer from being exposed to a shock hazard.

o INSULATION RESISTANCE TEST

1 .
2.
3.

Unplug the power cordand short the two prongs of the plug with a Jumper wire.

Turn on the power switch.

Measure the resistance value with ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as
screwheads antenna, control shafts, handle brackets, etc. Equipment with antenna terminals should read between 3M9
and 5.2MQ to all exposed parts. (Fig. A) Equipment without antenna terminals should read approximately infinity to
all exposed parts. (Fig. 8)

Note: Some exposed parts may be isolated from the chassis by design. These will read infinity.

4.

Antenna
terminal

Exposed Exposed
metal metal
part part
Ohmmeter Ohmmeter
(Fig-Al (Fig.8)
Resistance = 3M9-5.2 MQ Resnstance : Approx 00

If the measurement is outside the specified limits, there is a possibility of a shock hazard. The equipment should be
repaired and rechecked before it is returned to the customer.